August overheating: why the needle climbs and what a callout can fix at the kerb
Once stopped, the rule that protects you from a hospital visit: never open the radiator or coolant reservoir cap while the engine is hot. The system is pressurised and the escaping steam and coolant are well above 100 degrees. Let it cool for a genuine half hour. A roadside technician attending an overheating call, typically AED 200-400, will check for the visible causes: a split hose, a failed fan, a leaking radiator seam, low coolant with no obvious leak. A top-up and a fan diagnosis can put a mildly overheating car back on the road to a workshop under its own power, driven gently in the cool part of the evening.
What a kerb-side visit cannot fix is the damage overheating causes when ignored: a warped head or failed head gasket from driving on while the needle sat in the red. White exhaust smoke, coolant in the oil showing as a milky residue under the filler cap, or continuous bubbling in the reservoir are the signs the engine has crossed that line, and at that point the correct spend is a flatbed, not more coolant. This is the scenario where a cheap decision, driving one more exit, becomes a five-figure engine bill.